Cross Country Towing Round Trip 6000 miles

I had hoped to find more time to do a daily blog-ish update for this trip. However here I am on day 4 of my trip just writing the first post. My gang of 4 (2 littles, my wife and I) headed out from our home in NC to visit friends and family along the US and end up in CA for a couple weeks where I am originally from. The whole trip should be around 6000 miles. I left with 6108 on the odometer and on our 4th night now we are ~7500. I am having to fill up once a day and the first morning diesel was 3.44, then 3.41, then 3.33, then 3.26 today in Oklahoma where we are stopped. We are going between 57-63mph and I am mostly using the tow mode so the gears don't hunt as much. I turn it off down grades and on flat travel. Gas milage for the first 2 refills were 14.1 each and then a 13.1 and then a 14.6. We had a lot of wind today coming right at us today and the computer is showing 12.6 currently with about 115 miles to empty when I gas up tomorrow. I am not taking the time to hand calculate any milage on this trip but I have done it in the past and found it was always within .1 everytime I did it so I have stopped. The last thing I will add is I am towing a Rockwood Mini Lite 2504s for anyone wanting specs. It is ~5200lbs dry and I am guessing about 5800lbs with our stuff in it and some fluid in the tanks. I will update again in a few days I hope and if anyone has questions I will try to answer them. Pray for us and my sanity as I drive a 2 year old girl and 5 year old boy cross country!